Drill-supporting structure



J.' E. SHAW DRILL surroa'n'ue s'rwncruaz Fiied "85011 3. 1926 l ig. 2

INVENTOR BY .kbm ATTORNEY Patented May 24, 1927.

JOHN E. SHAW, OF MURPHEYS, CALIFORNIA.

- nnILL-sUrPonrInG STRUCTURE.

Application filed MarclrS, 1926. Serial No. 91,911;

T his invention relates to improvements in devices used to support rock drills of a certain standard type, when drilling in drifts, tunnels and the like.

Such drills, especially those known as the burley'drill, are now supported by means of a vertical machine-bar, extending between and held rigidly to theceiling and floor of the drift, and a horizontal arm which pro jeets outwardly from the bar and on which the drill-is supported. This arm is detachably and adjustably mounted on the bar by clamps of such character that it is very hard to keep thearm from turning with the back pressure ofthe drill, and very large heavy wrenches are necessary to exert sufficient force against the clamping bolts to maintain the clamps tight. I

The principal object of my invention is to provide a drill supporting structure, including a machine bar and the side arm, and connections between the arm and bar such that the arm is very easily adjusted in its radial setting without the need of any tools, and the vertical position of the arm is readily and quickly altered, while at the same time ghe arm cannot possibly turn relative to the A further object of the invention is to produce a simple and inexpensive device and yet one whichv will be exceedingly effective for the purpose for which it is designed.

These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a. perusal of the following specification and claims.

In the drawings similar characters of reference indicate corresponding parts in the several views:

Fig. 1 is a side elevation of the structure.

Fig. 2 is an enlarged section of the arm supporting member with the arm in position thereon. l

Fig. 3 is a sectional plan on the line 3-8 of Fig. 2 with the arm remove-d.

Fig. 4: is a detached view of the drill supporting arm;

Referring now more particularly to the characters of reference on the drawings, the numeral 1 denotes the machine bar having at its opposite ends enlarged pads 2, one pad being provided with a screw jack structure 3 as is customary, to enable the pads to be firmly abutte-d against floor and ceiling beams. Slidable on the bar is a member to support the horizontal drill supporting arm 4. This member comprises a central hub 5 connecting vertically spaced and somewhat wide flanges 6 and 7. The bar 1' may be squared, hexagonal, circular with a key-way or with a flattened surface, or of any other form; the only requirement being that the hub 5 while slidable on the bar cannot turn thereon. The upper flange 6 has an endless circular groove 8 projecting upwardly from its under face. This groove receives. a rounded boss 9 formed on the adjacent end of the arm 4 and extending at right angles thereto. The arm at said. end is square or rectangular in cross section as shown at 10, the height of this portion being about equal to the spacing between the flanges 6 1 and 7. To enable the boss 9 to be inserted into the groove 8 at any point without spreading the flanges (which are preferably formed integral with the hub 5) the under face of the portion 1O tapers upwardly to its end as shown. This permits the arm to be raised at its outer end sufliciently to cause the boss 9 to be lowered clear of the groove 8, when the arm may be drawn outwardly. At the same time it will be seen that the arm cannot swing beyond a horizontal position. nor can it be drawn straight out.

To hold the arm radial with the bar 1 the flanges 6 and 7 are provided with a plurality of pairs andradial and vertically alined,

holes 11, one hole of each pair in the flange 6 being located inthe plane of the groove 8, and the other hole being outwardly of said groove. The portion 10 of the arm 4 is drilled with holes to register with any pair of the flange holes, so that removable pins 12 may be placed through the flange and arm holes. It will therefore be seen that the arm cannot move laterally in the flange member without shearing the pins, and the flange member cannot turn on the bar. At the same time the removal of the pins enables the arm to be readily removed from any position and as quickly located in any position.

The flange member is held at any desired positionon the bar 1 by a clamping collar 13 disposed about the bar under said member. This collar does not need to be very heavy since there is practically no downward pressure on the same, other than the weight of the flange member itself. since the weight of the drill supported by the arm is imparted to the hub 5 as apressure tending to bind the same against the bar rather than to force it down.

From the foregoing description it will be readily seen that I have produced such ade vice as substantially fulfils the objects of the invention as set forth herein.

lVhile this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described my invention what I claim as new and useful and desire to secure by Letters Patent is:

1. A drill supportingstructure comprising a vertical bar adapted to be maintained in a fixed position, an arm to support adrill, a member slidably but non-turnably mounted on the bar, means between said member and the arm for removably supporting the latter in a horizontal position, said member including flanges spaced apart vertically a distance suflicient to receive one end of the arm therebetween, an upwardly projecting boss on said end of the arm, the under face of the upper flange being recessed all around to seat said boss in a number of different positions, and means between said arm and hinges to prevent lateral swinging movement of the arm.

2. A drill supporting structure comprising a vertical bar adapted to be maintained in a fixed position, an arm to support a drill, a member slidably but ,non-turnably mounted on the bar, means between said member and the arm for removably, supporting the latter in a horizontal position, said member including flanges spaced apartvertically a distance sufiicientrto receive one end of the arm therebetween, an upwardly projecting boss on said end of the arm, seat-, ing means for the boss in the upper flange, the arm and flanges having alined orifices theretl'irough, and removable pins through said orifices. V

In testimony whereof I afiix my.signature.

JOHN E. SHAW. 

